Wartenberg sign
Pronunciation: VAR-ten-berg
Involuntary abduction of the fifth digit due to ulnar nerve palsy affecting the third palmar interosseous muscle.
Full Definition
The Wartenberg sign is a clinical finding characterized by persistent abduction of the small finger that cannot be voluntarily corrected by the patient. This occurs due to ulnar nerve dysfunction affecting the third palmar interosseous muscle, which normally adducts the fifth digit. The unopposed action of the extensor digiti minimi causes the finger to remain in an abducted position. This sign is pathognomonic for ulnar nerve palsy and is often seen alongside other ulnar nerve deficits such as clawing of the ring and small fingers.
Usage
Usage note: Named after neurologist Robert Wartenberg - distinguish from other eponymous signs
In Context
- "The patient presented with a positive Wartenberg sign and weakness in grip strength." — Hand surgery evaluation
- "Post-operative examination revealed resolution of the Wartenberg sign following ulnar nerve decompression." — Follow-up surgical note